I created a custom shipping profile for one of my products ( ex. shipping rate = $10.00), however when I test it out at checkout by increasing the quantity from 1 to 2. The shipping rate remains at $10.00 - instead of a combined $20. At this rate, I'm taking a hit everytime someone orders a duplicate item - unless I include the shipping fee in the retail price. There must be a better fix for this.
Also, some suppliers sometimes charge a lower shipping rate for an additional item of the same type. This would complicate the idea of including shipping fees in the retail price.
I've come across this same issue. I'd like to add another rate, or conditional pricing based on the number of same items. Not by weight or order price. So that when someone buys multiple of the same item, the shipping is adjusted. What is a good work around or fix to this issue?